US1779740A - Valve - Google Patents

Description

Oct. 28, 1930. y R,'J KEHL 1,779,740

' VALVE File@ ySept. 28; 1928 v /5/4 1; Z- 2 i /7 I .Evi/1 22 wx' 2 Patented Oct. 28, 193() Uf f STT

ESSERE J'. REEL, 0F NEW YORK, N. Y., ASSIGNOR T0 OXWELD AGETYLENE COMPANY, I A. CORPORATION 0F WEST VIRGINIA VALVE Application flied September 28, 5.928. Serial Eo. 309,031.

This invention pertains to manually operable iuid regulating valves of small size and more specifically to means for securing a freer :How of fluid through such Valves/.w

Valves may be divided into tw classes according to their comparative sizes and the methods employed in theirV manufacture,

the first class including valves having a separate bonnet and a cast body with the inlet, outlet, and bonnet, openings cast therein and the second class including valves/,having a body and bonnet in one piece with all openings machined therein.

This invent-ion pertains to valves of the counterboring, and milling.

.The practice, heretofore, has been to cast a valve body of the desired shape and into this cast body to drill a valve stem opening part way through. From the bottom of the valve stem opening a fluid passage of smaller size was then drilled somewhat farther into the valve body. By the use of an end mill having -a tapered point the shoulder between the Y ing; an end having a taper corresponding to t-he taper of the valve seat thereby forming a valve on the end of the valve stem; and a short unthreaded portion just back of the end of the i valve stem forming a clearance space around the valve stem just above the seat where itis impractical to thread it. A stuiing box,

valve stem is so close to the wall of the valve stem opening that the fluid flowing through the valve can leave the opening in the valve seat only at the side of the valve stem where the outlet opening joins the valve stem opening. When a coarser thread is used .on the valve stem so it moves farther with less turns it is then difficult to seat the valve on the valve seat with sufficient pressure to prevent leakage. Therefore, one of the objects of this invention is the provisionof a valve having a free fluid passage from the opening in the valve seat to all sides of the valve stem. Furthermore, this invention includes all the other objects and novel features described andshown herein.

I attain the objects of this invention by the apparatus shown in the accompanying illustration in which: f

Figurefl is a vertical section of a valve embodying my invention;

Figure 2 is a similar viewof a valve only partially in section embodying a modified form of my invention; and,

Figure 3 is a horizontal section of the valve shown in Figure l along the line 3-3 looking in the direction of the arrows.-

-The apparatus embodying my invention may comprise a valve body 10 of cast metal such as brass having a threaded inlet coupling l1 at one side and a similar threaded outlet coupling 12 at another side. The inlet and outlet couplings shown are a Well knowntype` adapted for coupling the valve' to exible copper or brass tubing but this particular form of coupling is not essential as any other form may be used or, Where the valve forms an integral part of another piece of apparatus such as the rear body of a welding or cutting blow-pipe, the couplings may be dispensed with entirely. Furthermore, the position of the couplings With-relation to the 5 valve stem is not essential as" thev couplings and the inlet and outlet openings in the valve l. may occupy other positions than those shown. Rising from the top ofthe valve body 1() and integral therewith is a bonnet 13 and drilled downward through the bonnet 13 and y into theeralve body 10 is`a valve stern -openi ing 14 having a threaded portion 15. Below the threaded portion 15 is an enlarged portion 16 that is made by inserting a small side where it is joined by the outlet opening. The

annular enlargement l'may'also be made by inserting an expanding or undercutting tool in the valve stem opening 14 and the enlargement may be of a different shape or form from the examples shown. From the bottom of the valve stem opening 14 a fluid 'passage 1r8 of smaller size than the valve stem opening and in axial alignment 'therewith is drilled somewhat farther into the valve body 10 but not all the waytherethrough. By means of an angular end milling cutter or a counterbore the shoulder @between the valve stem opening 14 and the fluid passage 18 is'formed into a valve seat 4o 19. Above the threaded portion 15 'of the valve stem o ening 14 the bonnet 13 is counterbored to orm a stuliing box 20. An inlet passage 21 is drilled from the inlet coupling 11 to the uid passage 18, and an `outlet passage 22 is drilled from the outlet. coupling 12 .to the enlarged portion 16 or 17 of the valve stem opening 14.

In the valve: Astem opening 14 isa valve stem 23 having an Unthreaded portion 24 in the stuffing box 20; a threaded portion 25in the threaded portion 15 of the valve stem opening 14; an unthreaded portion 26 in the enlargement 16 of the valve stem. opening 14; and a tapered end forming a valve; 27 that may be seated on the valve seat 19. The length of the various portions of the valve stem 23 may vary. The threaded portion 25 should be long enough to have sufficientstrength to move the valve stem when it is rotated, sufficient wearing surface to prevent undue Wear, and short enough to permit the valve to be opened to full capacity volume v before the upper end of the threaded portion 25 ofthe valve stem 23 strikes the ring 31 in the bottom of the stuiiing box 20. Around the upper end of the valve stem 23 in the bottom of the stuffing box 20 is a metal ring 31 that forms a seat for the packing 29 just above it, thereby preventing the packing 29 from being forced into thethreaded portion 15 ofthe valve stem opening 14, and also forming a vbuffer for the upper end of the threaded portion 25 of the valve stem 23, to prevent it from mutilating'the packing 29 when the valve is opened to the limit of the valve stem movement. Above the packing 29 is aV gland` 28 that is adapted for compressing the packing 29 in the stuiiing box 20. A packing nut 30 is threaded `to the outside of the bonnet 13 and surrounds the valve stem 23 and bears upon the gland 28 so that when the packing nut 30 is screwed down on the bonnet 13 the glandl 28 is forcedinto the stung box 20 and the packing 2,9 is compressed so leakage between the valve stem 23 and the Wall of the valve stem opening 14of the bonnet .and valve body 10 is.

prevented. Secured to the upper end of the valve stem 23'is a suitable handle 32 by meansof which the valve stern 23 may be manually rotated for opening andclosing the valve. The handle 32 may be of a form other than that shown.

When the valve is in operation a high pressure fluid pipe line may be connectedto the inlet coupling 1 1, and a low pressure fluid pipe line may be connected to the outlet coupling 12. When the valve is closed, by screwing the valve stem 23 down until the valve 27 is pressed firmly against the valve seat 19, no fluid will flow through the valve. When the valve stem 23 is moved upward to the'v limit of its travel the valve is fully open and fluid may flow through the valve to its l full capacity volume. By openingthe valve different degrees fluid may be permitted to flow through the valve at various rates less than that of full capacity. v

Without the enlargement 16 or 17 of the valve stem opening 14 it was found necessary to open the valve six full turns f the valve stem l23`to secure a full capacity flow through the valve. With the enlargement 17 of the valve stem opening 14 it was necessary to open the valve three and one-half turns to secure a full capacity flow, and with the enlargement 16 of thesvalvestem opening it was found necessary to open the valve only two and one-half turns of the valve stem to secure a full capacityflow of Huid through the valve. Therefore, it is evident that the efficiency of the valve is greatly increased by the improved construction shown and described herein. Furthermore, it may be opened and closed quicker or it may be closed more securely than valves known heretofore.

.Various changes may be made in theconstruction of the valve, various alterations may be made in :the assembly, and various substitutions may be made for the materials described without departing from the invention or sacrificing any of the rights -thereunder.

I claim:

1. A valve having a cast body with all openings machined therein and comprising; a threaded valve stem opening having a conical bottom forming a valve seat; a fluid passage through said valve body and valve seat; and a threaded valve stem in said valve stem opening having a beveled end seating on said valve seat for closing said fluid passage; said valve stem opening being enlarged adjacent said valve seat to provide a free luid passage around said valve stem from the opening through said valve seat 2. A valve having a cast body with all openings machined therein and comprising;

a threaded valve stem opening having a conical bottom forming a valve seat; a fluid passage through said valve body and valve seat; a threaded valve stem in said valve stem opening having a beveled end seating on said valve seat for closin said iuid passage; said vvalve stem opening eing enlarged adjacent said valve seat to provide a free fluid passage around said valve stem from the opening through said valve seat; and means for preventing leakage between said valve stem and said body. j

3. A valve having a cast body with all openings machined therein and comprising; a threaded valve stem opening having a conical bottom forming a valve seat; a fluid passage through said valve body and valve seat;

a threaded valve stem in said valve stem opening and having a beveled end seating on said valve seat for closing said fluid passage; said valvestem opening being enlarged adjacent said valve seatto provlde a free uid passage around said valve stem from the opening in said valve seat; a handle on the outer end of said valve stem by which it may be operated; and means for 'preventing leakage between said valve stem and said body.

4. A valve having a cast body with all openings machined therein and comprising; a valve stem opening having a conical bottom forming a valve seat, a threaded portion, and an enlarged portion between said valve seat and said threaded portion; a fluid passage through said valve body and valve seat; and a valve stem in said valve stem opening having a threaded portion in the threaded portion of said valverstem opening, an unthreaded portion in the`enlarged portion of said valve stem opening, and a beveled por-- tion seating on said valve seat for closing said iuid passage.

5. A valve having acast brass body with all openings machined therein *and comprising; a valve stem opening having a conical bottom forming a valve seat, a threaded portion, and an enlarged portion betweensaid valve seat and said threaded portion; a fluid seat; and a valve stem 4in said valve stem opening having a threaded portion in the threaded portion of said valve stem opening, an unthreadedl 'portion iri the enlarged ortion of said valve stem opening, and a beveled portion seating on said valve seat for closing said Huid passage. I

6. A valve having a cast body; a drilled and threaded valve stem opening in said body having a tapered bottom forming a valve seat and an ,enlarged portion above said valve seat; a passage smaller-in diameter than said ,valve stemopening extending axially therefrom through said valve seat; an inlet opening drilled in said body to said passage; an outlet opening drilled in said body to the enlarged portion of said valve stern opening; and a threaded valve stem in said valve steml opening having a valve on thel end thereof seatingon said ,valve seat.

an enlarged portion above said valve seat and a threaded portion above said enlarged portion; a passage drilled from said valve stem opening through said valve seat; an inlet opening drilled from said inlet coupling to said passage; an outleit opening drilled 4from said outlet coupling to the enlarged portion of said valve stem opening; and athreaded valve stem in said valve stem opening havin a .beveled end forming a valve adapted or seating on saidvalve seat.

8. The combination in a valve having all openings machined in the body thereof, of a cast valve body; a passage for conducting a iuid through said valve body; means including a valve seat surrounding said passage between the inlet and outlet openings and 'a -valve stem with a valve on the end thereof openings machined in the body thereof, of a valve body of cast brass; a passage for conducting a fluid through said valve body; means including a valve seat surrounding said passage betweenthe inlet and outlet openings and a valve stem with a valve on the end thereof for regulating the ow of fluid through said valve body; and a clearance space in said passage for flow of Huid around all sdeso opening ROBERT J. KEHL.

providing a` said valve` `stem between the valve seat and the'v outlet

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